Answer:
3
Explanation:
Let be t = time to finish
s = average speed
Since is inversely proportional, if t is higher, s lower.
The constant of proportion (k) is
t = k / s
k = t * s
k = 37.5 * 4
k = 150
now that we know k, we can find s for t = 50 seconds
t = k / s
s = k/t
s = 150 / 50
s = 3